Pressure multiplying mechanism



May 26,` 1942. i H. E. PAGE PRESSURE MULTIPLYING MECHANISM Filed Marn1e, 1940 INVENTQR.

` 1 III www? mw m Patented May 26,1942

' UNITED. STATES PAT E N T O f 2,284,222 rarissime MUL'rrPLrrNcamcrrAnrsM FFIC Herbert E. Page, Syracuse, N. Y. Application March 18,1940, Serial No. 324,5 15

2 Claims.

' successive operating movements of said operating lever. .I

It further has for its object a' hydraulic )pressure multiplyingmechanism embodying a body held from movement in the direction of thepiston movement and constructed with two or more piston chambers,pistons working in the chambers, one of the pistons. being a. primemover, which may be actuated by hand, or in any suitable manner, and atransfer passage between the chambers having means, as a spring loadedcheck valve therein with enough resistance to normally prevent thetransferof the hydraulic liquid from the smaller or prime mover cham-Aber to the larger or power chamber, andto permit the flow of liquid fromthe prime mover chamber to the power chamber when the driven memberencounters resistance, so that upon preliminary operation, the driven oractuated part, is quickly operated by one or two movements of the primemover to take up lost motion between invention differs from that coveredby my Patent No. 2,154,956 issued April 18, 1939, in that lthe latterutilizes a shiftable body containing an anchored4 or fixed power pistonand rod while in 40 this invention vthe body of the, mechanism is y xedand the power piston is shiftable.

I have vhere illustrated my invention as applied Ato a hydraulic liftingjack.

In describing this invention, reference ishad to theaccompanying-drawing in which like characters designate correspondingparts in all the views. y

Figure 1 is a longitudinal sectional view through the pressuremultiplying mechanism.

Figure 2 is a similar view embodying a modified form of that shown inFigure l.

I is the body whiclr, is formed with piston chambers 2 and 3 extendinglengthwise thereof, these chambers being of diierent diameters andarranged in axial alinement, the chamber 2 of the larger diameter beingapower chamber for applying heavy pressure.

4 and 6 are pistons working respectively in, said chambers 2 and 3. 6

(Cl. e-52) The body I is also formed with a reservoirl for a hydraulicliquid and spring loaded valves l and 8 allow the hydraulicv liquid toflow from the reservoirj through the passages 9 and I0 into the pistonchambers 2 and 3' respectively but act. to prevent any reverse flow ofsaid liquid.

Spring loaded check valve I I mounted at the right end of the chamber 2allows hydraulic nuidj to flow from said piston chamber 2 into anntermediate or transfer chamber I2 formed in the body and adjustingspring loaded-check valve I3 allows iuid to flow from-chamber I2, whenthe.

ton I5 withia hydraulic liquid passage I5 extending through same andhaying its lleft end xed in the body I, is adapted to move freely inthepiston chamber I4. Heavypressure piston 5 is connected at I6 to onearm- I'I vof a bell crank pivoted at I8 to a fixed point and the otherarm I3 is provided with a suitable head, not shown, which rests againstthe work to which the pressure is to be applied, or in the case of ajack,

against the article to be raised.. The retracting spring 20 acts to keepthe arm I1 normally against the stop 2l. The parts i8, I9 are one-form'of meansv or mechanism for transmitting the motion of the piston 5 tothe work.

Suitable release valve means are provided for releasing the pressure inthe piston chambers to permit the mechanism to return to normal orstarting position, when desired. The mechanism here illustrated is asfollows:

A rod 22 passes through the upper portion of the reservoir 6 and isconnected to a head or disk- 23 and a spring 24 acts on the rod andtends to keep'the disk 23 pressed up against the balls 25l and 26 -andthus prevent any flowof hydraulic liquid from the chambers I2 and 3into-the reservoir 6 through release passages orports 255 25, Auntil therod 22 is raised by any suitable means, not shown. The passage 25acommunicates with the intermediate chamber I2 and with passage vanysuitable manner. As here shown, the prime ymover piston 4 is connectedby the link 21 to the lower arm 2 of a bell crank actuating leverpivoted at 29 to a vxed point, as the frame or carriage (not shown) forthemechanism and having an upper or actuating arm 30. -The body I isalso pivoted at a xed point 3 I e In operation, the operatinglever 30 isllrst l moved toward the right, and this. moves the piston 4 to the leftby means of the arm 23 and 0 the link 2l and this movement of the pistoni draws hydraulic fluid 4from the reservoir 6 through the check 1 andpassage 3 into the chamber 2. 'Ihe operating lever 30 is then moved tothe left and this moves the piston 4 to the' right and the liquid in thechamber 2 can not go back through the check soit is forced through thecheck valve into the chamber I2 and through the passage I5* into thechainacts against the ber I4, and thus acts on the piston 5 moving` 4said piston quickly to the right. Continued ref ciprocation of theoperating lever 30 continues `,creases the power of said piston 5. 2 Itwill be noted that during the initial movement of the piston 5 by meansof the hydraulic pressure in the chamber I4, additional hydraulic liquidis drawn through the check valve which keeps the space 3 nlled withliquid.

After the desired work has been accomplished and lit is desired toreturn the working partsto -normal or initial position, the rod 22 israised,

which allows the balls 25 and 26 to raise from their seats and eitherthe action of the retaining spring 20 or -the weight ofthe load will actthrough the arm I'I and the piston 5. and force the liquid inthelchamber 3 and the liquid in chamber I4 pastV the balls 26 and 25respectively into the reservoir 0, and thus allow the piston 5 and thearms I1 and I0 to return to their original position.

It is evident that the operating principle just described will be thesame if the small piston I5 was fixed within the large piston 5 and wasfree to move in the chamber I2 which would be made deep enough toallow-such movement.

In Figure 2 a construction is shownirr which the small piston |50, movesfreely within the large piston 50 and does not have its left end securedor fixed to the body |00.

In Figure 2, the body |00 is pivoted to a ilxed point in a suitableframe, not shown, at 3|0 and said bodyis formed with piston chambers 200and 300'. extending lengthwise thereof,` these piston |50 and the otherend of the piston |30 body |00 and thus tends to 'force the piston 50 tothe right.

The rod 220 acting through the disk 230 pressing/on the balls 250 and200 acts toprevent any iiuid from returning from the chambers and 300respectively. into the reservoir until said rod 220 is raised againstthe action of its retaining spring, not shown.

In operation, the piston ls oscillated by any suitable means, and thisdraws hydraulic fluid through the check .10 into the chamber 200, and

0 the right.

then forces said uid through the check ||0 into .the chamber |20and'through the passages |2|,

|22 and |23 into the chamber |40, where the 'pressure of theliiuid actsagainst the iloating piston and said piston acts against the body |00and the re-action of theforce in the chamber |40 causes the piston 50 tomove quickly to 40 causesa continuance of this operation until .thepiston 50 encounters the resistance of the work, and this resistanceincreases the pressure in the fluid in the chamber |40 which alsoincreases the pressure in the fluid in the chamber |20, and thisincrease of pressure overcomes the resistance of the spring loadedfcheokvalve |30 chambers being of different diameters and the A larger chamber300 being the power chamber. The 4pistons 40 and 50 work in the chambers200 and 300 respectively.

The body |00 is formed with a reservoir 60 and. spring loaded checkvalves l0 and 30 act to allow the hydraulic liquid to ow from the'reservoir into the piston chambers 200 and 300 respectively but preventany reverse flow of said liquid.

lhaving normally-closed. release valves,

and allows Ahydraulic iluid to flow from the chamber |20 into thechamber 333` and thus act on the large surface of the piston 50, thusproducing great pressure with slower movement of said piston.

Raising lever 220 vand releasing the balls 25| andl 260 from their seatsallows the liquid to escape from the chambers |40, |20 and 300 into thereservoir 60 and the piston 50 can return to its original position.

WhatIclaim is:

1. In a pressure multiplying mechanism, the combination of a bodyelement including piston chambers of dierent diameters arranged in axialalinement, an intermediate chamber, and a reservoir for a lhydraulicfluid overlying like sides of the alined piston chambers .andcommunicatingI with the pistonchambers through check valve controlledpassages extending radially relay tively to the piston chambers andcommunicating with ie intermediate chamber and the larger piston chamberthrough radial passages the smaller piston chamber communicating withthe intermediate chamber through a check valve controlled passage, thelarger piston being formed dwith a pressure chamber extending lengthwisethereof, an open passage connecting the intermediate. ychamber and theIpressure chamber in the larger pistonand a check valve controlledby-pass between the intermediate `chamber and the larger piston chamber,a prime mover for actuating the smaller piston, and mo- Continuedoscillation ofthe piston the pressure is -high enough, and all of abovei5 Spring loafded Vcheck valve ||0 mounted at the o right end of thechamber 200 allows hydraulic iluid to flow from said chamber 200 intochamber |20 and check Ivalve |30 allows liquid to ilow from chamber |20into the chamber 300, when tion transmitting means operated by thelarger. piston.J f

2. The pressure mechanism of ciaiml in which the`passage between theintermediate chamber and the pres- 'f multiplying transmission checkvalves act to' prevent any reverse flow of hydraulic iluid.

, Hydraulic fluid can also' flow from ,the chamber |20 through thepassage |2| into the passage |22 and throughv the passage |23 into thecham- 70 ber |40 at which point any pressure oi!A4 the hy'- draulicfluidv acts against the right end of the sure chamber in the largerpiston is provided by'a stationary tubular rod extending lengthwise ofthe larger piston chamber an'd the pressure chamber'there'in with thepassage of-the rod communicating with the intermediate chamber.

